Steam-actuated piston-valve



(Model.)

s. G. BRYBR.

STEAM AGTUATED P ISTON VALVE.

Patented Nov. 1, 1881.

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Elvira@ STATES "Afri-Nr @Ferca SAMUEL G. BRYER, OF SAUGUS, MASSACHUSETTS.

STEAM-ACTUATED PlSTON-VALVE.

SPECIFICATION forming part of Letters Patent No. 248,994, dated November 1, 1881.

l Application tiledMarch 7, 1881. (Model.)

To all whom it may concern:

Be it known that I, SAMUEL G. Barna, a citizen of the United States, residing at Saugus, in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in Piston-Valves; and I hereby declare that the same are fully described in the following specification and illustrated in the accompanying drawings. v

rlhis invention relates to improvements on steam-actuated piston-valves for pumps, roekdrills, steam-engines, and other motors actuated by steam, air, or water pressure; and it' consists, in combination with the piston-valve, of a movable piston-plug in each end of the valve-chamber and a direct and constant communication from the live-steam or other pressure supply to the rear ends of said pistonplugs, by which arrangement the latter are made to serve as elastic cushions for the piston-valve to strike against at the ends of its stroke, the pressure of steam, air, or'water behind them forming the elastic and yieldiirg` medium to take up the shock of the reciprocating piston-valve, and thus to prevent it from going too far in either direction. By this arrangement I produce elastic cushions for the piston-valve which are very durable, simple in construction, and better suited for the purpose than the coiled springs or other mechanical springs heretofore used to accomplish a similar result.

The invention is shown in the accompanying drawings as applied to a rock-drill cylinder; but it is equally well adapted to other inachines, as hereinabove mentioned.

l prefer to locate a detachable ring within the valve-chamber, at the inner end of each of the piston-plugs, which ring rests against a shoulder in the valve-chamber and serves as a stop against which the piston-plug is held by the pressure behind. Such rings may be removed when worn and new ones of the proper depth substituted. Each of such rings has an openin g or perforation on one side-to allow the steam or pressure to enter between the valve and inner end of the plug from the inlet-opening located opposite to such perforation in the said ring.

On the drawings, Figure l represents a longitudinal section of the valve-chamber and side View ot' a rock-drill cylinder. Fig. 2 represents a cross-section on the line AB, shown inFig. 1. Fig. 3 represents a plan view of one of the detachable stop-rings.

Similar letters refer to similar parts wherever they occur on the different parts of the drawings. l

a is the cylinder ofa rock-drill, as usual, having on one side thereof the induction-chamber b, with steam-supply pipe c, and passages d and el', leading to the interior of t'ne cylinder a in the ordinary way.

eis the valve-chamber on onc'side of the cylinder a, as shown. Within the valve-chamber e is the piston-valve f, movable up and down or in a line with the valve-chamber. The valve j' is actuated by steam entering through the openings g and g at each end of the valvechamber, as usual.

h is a channel leading from the inductionchamber b to the valve-chamber c, and t' and fi are openings leading from the valve-chamber to the upper and lower ends ofthe cylinder a in the ordinary manner.

7c and 7c are the movable piston-plugs, located in the upper and lower ends of the valvecham ber c, as and for the purpose described.

l and l are channels or ports leading from the induction-chamber b to the valvechamber e, and respectively to the rear of the pistonplugs k and it', as and for the purpose set forth. The inner ends of the piston-plugs L and k come to a stop, respectively, against the stoprings m and m', which are resting against shoulders a and a within the valve-chamber c, as shown in Fig. l. Each of the rings m and m is provided with a perforation or opening, o, opposite the openings g and g', so as to admit the steam to enter and pass off to and from each end of the piston-valve f.

f and f" are annular grooves or recesses, respectively, in the upper and lower ends of the piston-valvef, so as to allow the steam to enter between the end of said piston-valve an d either of its movable piston-plugs k and k', when it is brought against either of the latter, without closing the passages g and g.

- p and p are removable screw caps or covers at the upper and lower ends of the valvechamber e, either of which may be removed to get access to either of the plugs 7c or 7c' and IOO their stop rings m or m', as may be desired, for repairs or otherwise. It will thus be seen that A a direct and constant steam or other pressure and the channels l and 1, from the pressurex5 supply to the rear ends of the piston-plugs k and k', as and for the purpose set forth.

2. In combination, the movable piston-Valve f, the movable piston-plugs k and k', and their perforated stoprings m and m', all arranged zo within the alve-chamber e in amanner and for the purpose as specified.

In testimony whereof I have aflixed my si gnature in presence of two witnesses.

SAMUEL G. BRYER. Witnesses ALBAN ANDRN, HENRY CnADBoURN. 

